text: /*
  9
  Write a function called countDown
  that takes one parameter
  and return a string represent the count down from the number
  that insert to 0
  instead of 0 you shoulf have "done"
  between each number a comma and space
  ** you need to use recursion
  ** Important: You should't have extra space at the end and comma
  countDown(5)
  => "5, 4, 3, 2, 1, done"
  countDown(2)
  => "2, 1, done"
  countDown(7)
  => "7, 6, 5, 4, 3, 2, 1, done"
  */
  function countDown (x){
    var  i=0;
   var down= [];
      while (x>0){
  down[i]=x;
  i++;
  x--;
      }
      down[i]='done';
      return down;
  }
  console.log( countDown (5 ))